Welcome to your P & C of OC
1.
Which solvent is ideal for recrystallization?
2.
Which element forms Na2S in Lassaigne’s test?
3.
Lassaigne’s test converts nitrogen into
4.
Vacuum distillation is preferred when the compound
5.
Best method to separate kerosene and diesel
6.
Which halogen does NOT respond to Beilstein test?
7.
Fractional distillation differs from simple distillation due to presence of
8.
Steam distillation reduces boiling point because
9.
Which element cannot be detected by Lassaigne’s test?
10.
Addition of charcoal during crystallization removes
11.
Which solvent is unsuitable for crystallization?
12.
Dumas method estimates nitrogen by measuring
13.
Which impurity remains in mother liquor during crystallization?
14.
Which impurity is removed by filtration?
15.
Which method separates volatile liquid from non-volatile impurity?
16.
Which mixture requires fractional distillation?
17.
Chromatography separates components mainly based on
18.
Which technique separates dyes from ink?
20.
Kjeldahl’s method cannot estimate nitrogen in
21.
Which pair is separated by steam distillation?
22.
Which test confirms sulphur in organic compound?
23.
Which impurity is removed by washing crystals with cold solvent?
24.
Distillation works on difference in
25.
Which compound cannot be purified by steam distillation?
26.
Which pair is best separated by simple distillation?
27.
Which impurity cannot be removed by crystallization?
28.
Steam distillation is used for compounds which are
29.
Which method purifies iodine?
30.
Which compound is purified by sublimation?
31.
Beilstein test detects presence of
32.
Paper chromatography stationary phase is
33.
Sublimation is preferred for purification when the compound
34.
Which is NOT a stationary phase?
35.
Fractional crystallization is best applied when two solids differ mainly in
36.
Adsorption chromatography uses stationary phase as
37.
Petroleum ether is mainly used as
38.
Chromatography is ineffective if compounds have
39.
Which compound decomposes on heating hence needs vacuum distillation?
40.
Sulphur and nitrogen together give which Lassaigne extract result?
41.
Fractional crystallization requires
42.
Which solvent is polar?
43.
Rf value maximum possible is
44.
Which test detects chlorine?
45.
Fractionating column increases
